CN104051072B - The twisted-pair cable of shielding - Google Patents

Abstract

The present invention provides a shielded twisted pair cable, a wire cable (100) capable of transmitting digital data at a data rate of at least 5 gigabits per second (Gb/s). The wire cable (100) includes insulated twisted pair conductors (102, 104) and an inner conductor shield (116) enclosing the conductors (102, 104). The insulation (104, 108) of the twisted pairs (102, 104) is bonded to provide a consistent spacing between the conductors (102, 104). A ribbon (112) formed of a flexible dielectric is deployed between the shield (116) and the bonded twisted pairs (102, 104). The strap (112) provides a consistent spacing between the twisted pairs (102, 104) and the inner shield (116). The wire and cable (100) further includes drain wires (120) deployed outside the inner conductive shield (116) and inside the outer conductive shield (124), the outer conductive shield (124) encloses the drain wire (120) and the inner conductive shield ( 116) Both. This combination of elements provides a wire cable (100) having a consistent impedance capable of transmitting digital signals at a data rate of at least 5 Gb/s via a single twisted pair of conductors (102, 104).

Description

Shielded twisted pair cable

technical field

The present invention relates generally to wire cables, and more particularly to shielded twisted pair cables for transmitting digital electrical signals having data transfer rates of 5 gigabits per second (Gb/s) or higher.

Background technique

The increase in the speed of digital data processors has resulted in an increase in the speed of data transfer. The transmission media used to connect electronic components to these digital data processors must be constructed to efficiently transfer high speed digital signals between the various components. Wired media, such as fiber optic cable, coaxial cable, or twisted pair cable, may be suitable for applications where connected components are located in fixed locations and in relative proximity (eg, less than 100 meters apart). Fiber optic cables provide a transmission medium that can support data rates up to nearly 100 Gb/s and is virtually immune to electromagnetic interference. Coaxial cables typically support data transfer rates of up to 100 megabits per second (Mb/s) and have good immunity to electromagnetic interference. Twisted-pair cables can support data rates up to about 5Gb/s, but these cables typically require multiple twisted pairs within the cable either dedicated to transmit lines or multiple pairs of twisted pairs for receive lines. The conductors of a twisted pair cable provide good resistance to electromagnetic interference, which can be improved by including a shield of the twisted pair within the cable.

Data transfer protocols such as Universal Serial Bus (USB) 3.0 and High Definition Multimedia Interface (HDMI) 1.3 require data transfer rates at or above 5 Gb/s. Existing coaxial cables cannot support data rates approaching this speed. Both fiber optic cables and twisted pair cables are capable of transmitting data at these transfer rates, however fiber optic cables are significantly more expensive than twisted pair cables, making them ideal for cost sensitive applications that do not require high data transfer rates and immunity to electromagnetic interference. less attractive for applications.

Infotainment and other electronic systems in cars and trucks are beginning to require cables capable of carrying high data rate signals. Automotive-grade cables must not only meet environmental requirements such as heat and moisture resistance, they must also be flexible enough to define routing in a vehicle's wiring harness and have low mass to help meet vehicle fuel economy requirements. Therefore, there is a need for wire cables with high data transfer rates that are of low mass and flexible enough to be packaged within vehicle harnesses, while meeting cost targets that fiber optic cables currently cannot meet. Although the specific application given for this wire and cable is automotive, the wire and cable will also find other applications such as aerospace, industrial control, or other data communications.

It should not be assumed that subject matter discussed in the Background section is prior art merely because it is mentioned in the Background section. Similarly, issues mentioned in this background section or associated with the subject matter of this background section should not be assumed to have been previously recognized in the prior art. The subject matter in this background counting section merely represents different approaches, which may also be inventions in and of themselves.

Contents of the invention

According to one embodiment of the present invention, a wire and cable for transmitting electrical signals is provided. The wire cable includes a central twisted pair of conductors, hereinafter referred to as the twisted pair. Each conductor is enclosed within a dielectric insulator. The insulators are bonded together and run the length of the wire cable. Another dielectric insulator, hereinafter referred to as tape, encloses the twisted pair. A thin conductive layer (hereinafter referred to as inner shield) encloses the strip. The inner shield is wrapped longitudinally around the band. A third conductor (hereinafter referred to as a drain wire) is disposed on the outside of the inner shield, runs generally parallel to the twisted pair and is in electrical communication with the inner shield. A braided conductor (hereinafter referred to as the other shield) encloses and is in electrical communication with both the inner shield and the drain wire. A further dielectric insulator (hereinafter referred to as sheath) encloses the braided conductor. The wire and cable are capable of transmitting digital data at speeds of up to 5 gigabits per second and have an insertion loss of less than 20 decibels (dB).

In another embodiment of the present invention, a wire cable for transmitting electrical signals having a single pair of twisted pair conductors is provided. The wire cable having a single pair of twisted-pair conductors is capable of transmitting digital data at speeds up to 5 gigabits per second and has an insertion loss of less than 20 decibels (dB).

Further characteristics and advantages of the invention will appear more clearly on reading the following detailed description of preferred embodiments of the invention, given by way of non-limiting example only and with reference to the accompanying drawings.

Description of drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

Figure 1a is a perspective cutaway view of a wire and cable according to one embodiment;

Figure 1b is a cross-sectional view of the wire and cable of Figure 1a according to one embodiment;

Figure 2 is a partial cross-sectional view of the wire and cable showing the strand lengths of the wire and cable of Figure 1a according to one embodiment;

Figure 3a is a perspective cutaway view of a wire and cable according to another embodiment;

Figure 3b is a cross-sectional view of the wire and cable of Figure 3a according to another embodiment;

Figure 4a is a perspective sectional view of a wire and cable according to yet another embodiment;

Fig. 4b is a cross-sectional view of the wire and cable of Fig. 4a according to yet another embodiment;

Figure 5 is a cross-sectional view of the wire and cable of Figure 4a according to yet another embodiment;

Figure 6 is a graph illustrating signal rise times and expected cable impedance for several high speed digital transmission standards;

Figure 7 is a graph illustrating various performance characteristics of the wire and cable of Figures 2a-4a according to several embodiments; and

8 is a graph of differential insertion loss versus signal frequency for the wire and cable of FIGS. 1a-4b according to several embodiments.

Detailed ways

Presented here are wires and cables capable of carrying digital signals at rates up to 5 gigabits per second (Gb/s) (5 billion bits per second). The wire cable includes twisted pair conductors to minimize low frequency electromagnetic interference of digital signals carried by the wire cable. The cable also includes a conductive shield to further isolate the conductors from electromagnetic interference. The twisted pairs are enclosed within a dielectric tape that provides a consistent radial distance between the twisted pairs and the shield and also positions a consistent twist angle between the twisted pair conductors. A consistent radial distance and a consistent twist angle between the twisted pair and the shield provide a more consistent impedance for the wire and cable.

Figures 1a and 1b illustrate a non-limiting example of a wire and cable 100 for transmitting electrical digital data signals. The wire cable 100 includes a central twisted pair of conductors including a first conductor 102 and a second conductor 104 . The first and second conductors 102, 104 are formed of a conductive material with good electrical conductivity, such as unplated copper or silver plated copper. As used herein, copper refers to elemental copper or copper-based alloys. Further, as used herein, silver refers to elemental silver or silver-based alloys. The design, construction, and sources of copper and silver-plated copper are well known to those skilled in the art. The first and second conductors 102 , 104 may each include seven small strands of wire 106 . Each of the small wire strands 106 of the first and second conductors 102, 104 may be characterized as having a diameter of 0.12 millimeters (mm), which is generally equivalent to 28 American Wire Gauge (AWG) standard wire. Alternatively, the first and second conductors 102, 104 may be formed from stranded wire having a smaller gauge, such as 30 AWG or 32 AWG.

As shown in FIG. 2, the central twisted pairs of the first and second conductors 102, 104 are twisted longitudinally over a length L, eg, every 8.89 mm. Twisting the first and second conductors 102, 104 reduces low frequency electromagnetic interference of signals carried by the twisted pairs.

Referring again to FIGS. 1 a and 1 b, each of the first and second conductors 102 , 104 is enclosed within a respective first dielectric insulator 108 and second dielectric insulator 110 , hereinafter referred to as the first and second dielectric insulators. Two insulators 108,110. The first and second insulators 108, 110 are bonded together. The first and second insulators 108 , 110 extend the entire length of the wire cable 100 except for portions at the ends of the cables that are removed to terminate the wire cable 100 . The first and second insulators 108, 110 are formed from a flexible dielectric material, such as polypropylene. The first and second insulators 108, 110 may be characterized as having a thickness of approximately 0.85 mm.

Bonding the first insulator 108 to the second insulator 110 helps maintain the spacing between the first and second conductors 102, 104 and keeps the twist angle Θ (see FIG. 2 ) between the first and second conductors 102, 104 unanimous. The methods required to manufacture conductors with bonded insulators are well known to those skilled in the art.

The central twisted pair of first and second conductors 102, 104 and first and second insulators 108, 110 are completely enclosed within a third dielectric insulator 112 (hereinafter tape 112), except at the end of the cable. The portion that is removed to terminate the wire cable 100 . Strap 112 is formed from a flexible dielectric material, such as polyethylene. As illustrated in Figure Ib, the strap may be characterized as having a diameter D of 2.22mm. A release agent 114, such as a talc-based powder, may be applied to the outer surfaces of the bonded first and second insulators 108, 110 so that when the ends of the first and second insulators 108, 110 are removed from the first and second Stripping the conductors 102 , 104 to form the ends of the wire cable 100 facilitates removal of the tape 112 from the first and second insulators 108 , 110 .

The strap 112 is completely enclosed within a thin conductive layer 116 (hereinafter referred to as the inner shield 116 ), except for portions at the ends of the cable that are removed to terminate the wire cable 100 . The inner shield 116 is longitudinally wrapped in a single layer around the tape 112 such that it forms a single seam 118 that runs generally parallel to the central twisted pair of the first and second conductors 102 , 104 . The inner shield 116 is not helically wrapped or helically wrapped around the band 112 . The seam edges of the inner shield 116 may overlap such that the inner shield 116 covers at least 100% of the outer surface of the strap 112 . Inner shield 116 is formed from a flexible conductive material, such as aluminized biaxially oriented PET film. Biaxially oriented polyethylene terephthalate films are commonly known under the tradename MYLAR, and aluminized biaxially oriented PET films will hereinafter be referred to as aluminized MYLAR films. Aluminized MYLAR films have a conductive aluminum coating applied to only one of the major surfaces; the other major surface is non-aluminized and therefore non-conductive. The design, construction, and sources of single-sided aluminized MYLAR films are well known to those skilled in the art. The non-aluminized surface of inner shield 116 is in contact with the outer surface of strap 112 . Inner shield 116 may be characterized as having a thickness less than or equal to 0.04 mm.

The strap 112 provides the advantage of maintaining a consistent radial distance between the first and second conductors 104 and the inner shield 116 . The strap 112 further provides the advantage of keeping the twist angle Θ of the first and second conductors 102, 104 consistent. Shielded twisted pairs are found in the prior art to typically have only air as the dielectric between the twisted pair and the shield. Both the distance between the first and second conductors 102, 104 and the inner shield 116, and the effective twist angle Θ of the first and second conductors 102, 104 affect the wire cable impedance. Accordingly, a wire cable having a more consistent radial distance between the first and second conductors 102, 104 and the inner shield 116 and a more consistent twist angle Θ of the first and second conductors 102, 104 provides a more consistent impedance.

As shown in FIGS. 1 a and 1 b , the wire cable 100 additionally includes a third conductor 120 , hereinafter referred to as a drain wire 120 , disposed outside the inner shield 116 . The current drain wire 120 extends generally parallel to the central twisted pair of the first and second conductors 102, 104 and is in intimate contact with, or at least in electrical communication with, the aluminum-coated outer surface of the inner shield 116 . The drain wire 120 may include seven small strands of wire 122 . Each of the small wire strands 122 of the drain wire 120 may be characterized as having a diameter of 0.12 mm, which is generally equivalent to 28 AWG stranded wire. Alternatively, the drain wire 120 may be formed from stranded wire of a smaller gauge, such as 30 AWG or 32 AWG. The drain wire 120 is formed of a conductive wire, such as an unplated copper wire or a tin-plated copper wire. The design, construction, and sources of copper and tinned copper conductors are well known to those skilled in the art.

As illustrated in Figures 1a and 1b, the wire and cable 100 further includes a braided conductor 124, hereinafter referred to as the outer shield 124, enclosing the inner shield 116 and the drain wire 120, except at the end of the cable where the wire and cable 100 are terminated. part that is removed. Outer shield 124 is formed from a plurality of braided conductors, such as copper or tinned copper. As used herein, tin refers to elemental tin or tin-based alloys. The design, construction, and sources of braided conductors used to provide wire shielding are well known to those skilled in the art. Outer shield 124 is in intimate contact with, or at least in electrical communication with, both inner shield 116 and drain wire 120 . The wires forming outer shield 124 may be in contact with at least 65% of the outer surface of inner shield 116 . Outer shield 124 may be characterized as having a thickness less than or equal to 0.30 mm.

The wire cable 100 shown in FIGS. 1 a and 1 b further comprises a fourth dielectric insulator 126 , hereinafter referred to as sheath 126 . Sleeve 126 encloses outer shield 124 except for portions removed at the cable ends to terminate wire cable 100 . Sleeve 126 forms an outer insulating layer, providing both electrical insulation and environmental protection for wire and cable 100 . Sheath 126 is formed from a flexible dielectric material, such as cross-linked polyethylene. Sleeve 126 may be characterized as having a thickness of approximately 0.1 mm.

Constructing wire cable 100 such that inner shield 116 fits snugly against strap 112 , outer shield 124 fits snugly against drain wire 120 and inner shield 116 , and sleeve 126 fits snugly around outer shield 124 minimizes the formation of air gaps between these elements. This provides the wire cable 100 with increased magnetic permeability.

Wire cable 100 may be characterized as having an impedance of 95 ohms.

The elements shown in Figures 3a-5 (where the last two digits of the reference numerals correspond to the last two digits of the reference numerals shown in Figure 2a) perform as described above in the embodiment of Figure 2a. Corresponding components have the same or similar functions.

Figures 3a and 3b show another non-limiting example of a wire cable 200 for transmitting electrical digital data signals. The wire and cable 200 illustrated in FIGS. 3a and 3b is identical in construction to the wire and cable 100 shown in FIGS. A wire conductor such as unplated copper wire or silver plated copper wire having a cross-section of approximately 0.321 square millimeters (mm ² ), which is generally equivalent to 28 AWG solid wire. Alternatively, the first and second conductors 202, 204 may be formed from solid wire having a smaller gauge, such as 30AWG or 32AWG. Wire cable 200 may be characterized as having an impedance of 95 ohms.

Figures 4a and 4b show another non-limiting example of a wire cable 300 for transmitting electrical digital data signals. The wire and cable 300 illustrated in Figures 4a and 4b is identical in construction to the wire and cable 200 shown in Figures 3a and 3b, with the exception that the drain wire 320 comprises a solid wire conductor (such as a non-woven wire having a cross-section of about 0.321mm2 ⁾ . plated copper or tinned copper conductor), which is generally equivalent to 28AWG solid wire. Alternatively, the drain wire 320 may be formed from a solid wire of a smaller gauge, such as 30AWG or 32AWG. Wire cable 300 may be characterized as having an impedance of 95 ohms.

Fig. 5 shows yet another non-limiting example of a wire cable 400 for transmitting electrical digital data signals. The wire cable 400 illustrated in FIG. 5 is similar in construction to the wire cables 100 , 200 , 300 shown in FIGS. 2 a - 4 b , however, the wire cable 400 includes multiple pairs of first and second conductors 402 , 404 . The tape 412 also eliminates the need for separate spacers to maintain the pairs of twisted pairs as seen in the prior art for wire cables having multiple pairs of twisted-pair conductors.

Figure 6 shows the wire and cable requirements for signal rise time (in picoseconds (ps)) and differential impedance (in ohms (Ω)) for both the USB3.0 and HDMI1.3 standards, and for Meet the combination requirements of the two standards for wires and cables.

FIG. 7 illustrates expected performance characteristics of wire cables 100 , 200 , and 300 . Wire cables 100 , 200 , and 300 are expected to meet the combined USB3.0 and HDMI1.3 signal rise time and differential impedance requirements shown in FIG. 6 .

FIG. 7 shows the expected differential impedance of wire cables 100 , 200 , and 300 over a signal frequency range of 0 to 7500 MHz (7.5 GHz).

Figure 8 shows the expected insertion loss for wire cables 100, 200, and 300 having a length of 7 m over a signal frequency range of 0 to 7.5 GHz.

Thus, as shown in FIGS. 7 and 8 , wire cables 100 , 200 , and 300 having lengths up to 7 meters are expected to be capable of transmitting digital data at speeds up to 5 gigabits per second with an insertion loss of less than 20 dB.

Accordingly, wire cables 100, 200, 300, and 400 are provided. The wires and cables 100, 200, 300, and 400 are capable of transmitting digital data signals at a data rate of 5 Gb/s or higher. The wire cables 100, 200, 300 are capable of transmitting signals at this rate on a single twisted pair of conductors rather than multiple twisted pairs as used in other high speed cables capable of supporting similar data transfer rates, such as Category 7 cables on-line. The use of a single twisted pair as in the wire and cable 100, 200, 300 provides the advantage of eliminating the possibility of crosstalk between multiple pairs of wires as occurs in other wires and cables having multiple twisted pairs sex. The single twisted pair in the wire and cable 100, 200, 300 also reduces the mass of the wire and cable 100, 200, 300, which is important in weight sensitive applications such as automotive and aerospace. The straps 112, 212, 312, 412 between the first and second conductors 102, 202, 302, 402, 104, 204, 304, 404 and the inner shield 116, 216, 316, 416 help maintain the first and second Consistent radial distance between the conductors 102, 202, 302, 402, 104, 204, 304, 404 and the inner shield 116, 216, 316, 416, especially when the cable is defined as the wire cable 100, 200 within the automotive wiring harness assembly , 300, 400 wiring needs to be bent. Maintaining a consistent radial distance between the first and second conductors 102, 202, 302, 402, 104, 204, 304, 404 and the inner shield 116, 216, 316, 416 provides consistent cable impedance and more reliable data transfer rate. The combination of straps 112, 212, 312, 412 and first and second insulators 108, 208, 308, 408, 110, 210, 310, 410 help maintain the first and second conductors 102, 202 in a twisted pair , 302, 402, 104, 204, 304, 404 between the twist angle Θ, also, especially when the cable is bent. This also provides consistent cable impedance. Thus, a combination of elements such as first and second insulators 108, 208, 308, 408, 110, 210, 310, 410 and straps 112, 212, 312, 412, inner shields 116, 216, 316, 416 The combination, rather than any one particular component, provides wires and cables 100, 200, 300 with consistent impedance capable of transmitting digital data at speeds of 5 Gb/s or higher even when the wires and cables 100, 200, 300, 400 are bent , 400.

While the invention has been described in terms of its preferred embodiments, the invention is not intended to be so limited but only as defined in the following claims. Furthermore, the use of the terms first, second, etc. does not denote any order of importance, but rather the terms first, second, etc. are used to distinguish one element from another. Furthermore, the use of the terms a, an etc. does not imply a limitation of quantity but rather the presence of at least one of the items mentioned.

Claims (28)

1. A wire and cable (100) for transmitting electrical signals comprising: a central twisted pair of first and second conductors (102, 104), each conductor is enclosed within a respective first and second dielectric insulator, the first and second dielectric insulators being bonded together and extend over the length of said wire and cable (100); a third dielectric insulator (112) enclosing said central twisted pair of first and second conductors (102, 104); a thin conductive layer (116) enclosing the third dielectric insulator (112), wherein the thin conductive layer (116) wraps longitudinally around the third dielectric insulator (112), and wherein the third A dielectric insulator (112) provides a consistent radial spacing between said conductive sheet (116) and said central twisted pair of first and second conductors (102, 104), thereby providing said wire and cable (100) providing consistent impedance; A third conductor (120) outside of said conductive sheet (116), extending generally parallel to said central twisted pair of first and second conductors (102, 104) and connected to said conductive sheet (116) ) telecommunication; a braided conductor (124) enclosing the conductive sheet (116) and the third conductor (120) and in electrical communication with the conductive sheet (116) and the third conductor (120); and a fourth dielectric insulator (126) enclosing said braided conductor (124), whereby said wire cable (100) having a length of at least 7 meters is capable of operating at up to 5 gigabits per second with an insertion loss of less than 20 dB speed to transfer digital data. 2. The electric wire and cable (100) according to claim 1, characterized in that, the first conductor (102) and the second conductor (104) are formed of copper. 3. The wire and cable (100) according to claim 2, characterized in that the first conductor (102) comprises seven small wires (106), and the second conductor (104) comprises seven small strands Strands of wire (106). 4. The wire and cable (100) according to claim 3, characterized in that each of the small wires (106) of the first conductor (102) and the second conductor (104) is small The strands were characterized as having a diameter of 0.12 millimeters (mm). 5. The wire and cable (100) according to claim 2, characterized in that, the first conductor (202) and the second conductor (204) comprise solid wire conductors, and the solid wire conductors have a thickness of 0.321 square millimeters (mm ² ) cross section. 6. The wire and cable (100) according to Claim 1, characterized in that, the third conductor (120) is formed of copper. 7. The wire and cable (100) according to Claim 6, characterized in that, the third conductor (120) comprises seven small wires. 8. The wire and cable (100) according to claim 7, characterized in that each of the small wire strands of the third conductor (120) is characterized by a diameter of 0.12mm. 9. The electric wire and cable (100) according to claim 6, characterized in that, the third conductor (320) is composed of a solid wire conductor, and the solid wire conductor has a cross-section of 0.321 square millimeters (mm ² ). 10. The wire and cable (100) according to claim 1, characterized in that said central twisted pairs of the first and second conductors (102, 104) are twisted longitudinally every 8.89 mm. 11. The wire and cable (100) of claim 1, wherein the first and second dielectric insulators (104, 108) are formed of polypropylene. 12. The wire and cable (100) according to claim 1, characterized in that, the third dielectric insulator (112) is formed of polyethylene. 13. The wire and cable (100) according to claim 12, characterized in that the third dielectric insulator (112) is characterized by a diameter of 2.22mm. 14. The electric wire and cable (100) according to claim 1, characterized in that the conductive thin layer (116) covers at least one hundred percent of the outer surface of the third dielectric insulator (112). 15. The wire and cable (100) according to Claim 14, characterized in that, the conductive thin layer (116) is formed of an aluminum-coated film. 16. The wire and cable (100) according to Claim 15, characterized in that the non-aluminized surface of the aluminized film is in contact with the outer surface of the third dielectric insulator (112). 17. The wire and cable (100) according to Claim 15, characterized in that, the conductive thin layer (116) is characterized by having a thickness less than or equal to 0.04mm. 18. The wire and cable (100) according to claim 1, characterized in that the braided conductor (124) is formed of tinned copper. 19. The wire and cable (100) of claim 18, wherein the braided conductor (124) is in contact with at least sixty-five percent of the outer surface of the conductive sheet (116). 20. The electric wire and cable (100) according to claim 19, characterized in that the braided conductor (124) is characterized by having a thickness less than or equal to 0.30mm. 21. The wire and cable (100) according to claim 1, characterized in that, the fourth dielectric insulator (126) is formed of cross-linked polyethylene. 22. The wire and cable (100) according to Claim 21, characterized in that, the fourth dielectric insulator (126) is characterized by having a thickness of 0.1 mm. 23. The wire and cable (100) of claim 1, wherein a release agent (114) is applied to an outer surface of the combined first and second dielectric insulators (104, 108). 24. The wire and cable (100) according to claim 1, characterized in that, the wire and cable (100) is characterized by having an impedance of 95 ohms. 25. The wire and cable (100) according to claim 1, characterized in that said wire and cable (100) having a length of up to 7 meters is characterized for signals having a signal component of less than 100 megahertz (MHz), Have a differential insertion loss of less than 1.5 decibels (dB); less than 5dB for signals with signal content between 100MHz and 1.25 gigahertz (GHz); less than 5dB for signals with signal content between 1.25GHz and 2.5GHz 7.5dB; and less than 25dB for signals with signal components between 2.5GHz and 7.5GHz. 26. The wire and cable (100) according to claim 1, characterized in that the wire and cable (100) is characterized as having an inter-pair skew of less than 15 picoseconds per meter. 27. The wire and cable (100) according to claim 1, characterized in that, the wire and cable (100) is characterized by having a bending radius of less than 31 mm. 28. A wire and cable (100) for transmitting electrical signals, comprising: A single twisted pair of first and second conductors (102, 104), each conductor is enclosed within a respective first and second dielectric insulator (104, 108), the first and second dielectric electrical insulators are bonded together and extend the length of said wire cable (100); a release agent (114) applied to the outer surfaces of said bonded first and second dielectric insulators (104, 108); a third dielectric insulator (112) enclosing said single twisted pair of first and second conductors (102, 104); A conductive thin layer (116), enclosing the third dielectric insulator (112), characterized in that the conductive thin layer (116) is wrapped longitudinally around the third dielectric insulator (112), and its characterized in that said third dielectric insulator (112) provides a consistent radial spacing between said conductive sheet (116) and said single twisted pair of first and second conductors (102, 104) , thereby providing a consistent impedance for the wire and cable (100); A third conductor (120) outside of said conductive sheet (116) extends generally parallel to said single twisted pair of first and second conductors (102, 104) and is connected to said conductive sheet (116) Telecommunications; a braided conductor (124) enclosing the conductive sheet (116) and the third conductor (120) and in electrical communication with the conductive sheet (116) and the third conductor (120); and a fourth dielectric insulator (126) enclosing said braided conductor (124), whereby said wire cable (100) having a length of at least 7 meters is capable of operating at up to 5 gigabits per second with an insertion loss of less than 20 dB speed to transfer digital data.